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Rotorcraft control response using linearised and non-linear flight dynamic models with different inflow models

Published online by Cambridge University Press:  23 February 2017

T. Sakthivel  and
C. Venkatesan
T. Sakthivel*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
C. Venkatesan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
*
sakvel@iitk.ac.in
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Abstract

The aim of the present study is to develop a relatively simple flight dynamic model which should have the ability to analyse trim, stability and response characteristics of a rotorcraft under various manoeuvring conditions. This study further addresses the influence of numerical aspects of perturbation step size in linearised model identification and integration timestep on non-linear model response. In addition, the effects of inflow models on the non-linear response are analysed. A new updated Drees inflow model is proposed in this study and the applicability of this model in rotorcraft flight dynamics is studied. It is noted that the updated Drees inflow model predicts the control response characteristics fairly close to control response characteristics obtained using dynamic inflow for a wide range of flight conditions such as hover, forward flight and recovery from steady level turn. A comparison is shown between flight test data, the control response obtained from the simple flight dynamic model, and the response obtained using a more detailed aeroelastic and flight dynamic model.

Keywords

Helicopter flight dynamicsinflow modelupdated Drees inflow
Type
Research Article
Information
The Aeronautical Journal , Volume 121 , Issue 1238 , April 2017 , pp. 553 - 575
Copyright
Copyright © Royal Aeronautical Society 2017 

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References

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